Seldon is an average human by all measurements. He has black hair that hangs not quite down to his shoulders. The state of his facial hair is tied directly to how long he's been away from civilization, ranging from smooth-faced to grizzly bear. He dresses in a simple color scheme of blacks, greys, and blues, and he has a preference for wielding firearms. He takes care of what few items he owns. He doesn't care if things get dirty, he cares if they stink or if the manner of dirtiness will damage or impede function, so you might see him with dusty pants but freshly cleaned boots, for example.